Loud speaker



May 29, 1928.

w. F. HENDRY LOUD SPEAKER Filed Aug. 14, 1924 TTORNEY ue summits, am!

is cortex-31mm?" piw'luml. 'lwo lypirs Hf (llillllil't tflliH lumhawiiw generally known, imv ly w ii of illl BONES and iii $0 for ilie l'ep losmclmn fml zmsponil in 'llll? it IS the invoniiiw itn PlOlilfll" z ll ii repz'mli flrwylwmm more nniverml' fl'lfililijli and one which will 1i wperly respond to lhu llUlPS of the loficuv and lhvi' C2ll2$ With this rils vut in VlQW l sm'mol iep'roilucingg (lcvii'e wlii r-h ,-i' 1ii n-i.-i-s; u relatively flimnllfisziil iilinphi'n rn'i and dim large, lease diaphragm, lmlh Illillllllfigflllfi being ('IPPiii'l-(l lay :1 cnnnnmi lllllliih'llSH'l. In HCCOl'i'lih'lii? u'ilh mm of lili i'v-Liimw nf the present im'flntion, 1e rip-ruling men-han'im consists of l'he ammim'rif nn @lwbroi'nag'nel m pi'oyoi'l'ii'mei'l llllil :iiljuslr that dating ils ri poirz'il ion relvisliw'iy :lighr movei'ziienls a imparted to the large, and relatively large movements in the small diaphragmsn The drawing represmis a plain View P1113: ly in section of i1 telephone loud Slllfllifli embodying; 'fualui'i of the prey-n4. mvenlzion.

The mag-lam, :liuctuze is the as; iilescribcil i pi'nvielv a al mhslantinlly n m copen-ilmg filed August in lilll gihl" i ziml ezuiil It: l3 uli'miwjl h means of suitable w l l to the :ipux of :1 large paper dia- .lw. his paper diaphragm is in the :1v ilmzhle (2011? one end of which is ml is miiriml ll :1, ring 16. The :nqq'wnlwl on :1 bracket 17 cal-rying' aim :mns l? and 1.9 on WlllCil the mug nut llll-i' l'l. is n'muntei Th1? bucket 17 lF l li illl fll L0 :11] upright; pi'ojvz-ling from a l'LIFQ Ell. 'llw strut- 1i. hrring near the poinl Oil .vllfltfl'iblfill or pivot point: of the miniature h, will pin-form fil'll) rchilively slight mmvnmnii him, in rospwnsn in \Hl'lniirms: in thrvlcclriv lm'ionl, llflCWSllUI coils 3 and 2. ill m'mnl'uri- 5 is: wmwczl in \ihmlo l PlWWQCEl lllt! pole pliliF-i N illlfl S. 'lhnsrs Slighi lilffl'ilflflllil ml lluml 2 hmwwr, fil'l snlliciml' in (111150 (ll$[)l;ll"(lll(nl nl lhv luriru iliziphmgm 15 that rvsull' in llm rvpi'n- (.llltlllOll 01 w-och Armther strut is attached to the armahire 8 at a greater distance from its? center of rotation. The strut pas-was through a notch cut in one of the N pole piece; benl. out of plate 4. The 0nd of the strut 22 is fastened by suitable 11mins to n taut metallic diaphragm S23 clamped between a ririg 2A through an openin 27 in the casing 20.

mounted on bracket 1? and a, casing 25 which screws on the ring :24. Through the longer leveraga insured by the strut 22, the movements of the armature 28 are translated into vihration's of relatively largo amplitude of the metal diaphragm 23, and they; are ainplificd by means of a rillttlllll'j horn 26 with which the diaphragm 23 communi ates What I claim is:

1. in a sound z-oproducvr. an arm pivoted near the center and vibrated in autoi'daimc with the sounds to be reproduced, two struts attached to said arm, one near its center and the other near its end, and two diaphragms, one i't-sponsive to high and the other to low notes operated by said struts.

52. In a loud speaker, an armature supported near its ccntci', magnetic means actin; on hoth ends of said annaturc, a taut, and :1V loose diaphragm, a strut having one end attachcd to said armature near its centcr and tho other and to said loosediaphragin, and another strut having one end atlachcd to said armature far from its cenicr and the other and to tho taut diaphragm.

$5. In a telephone loud spcaltm armaiui'c snpportcd near its center. magnetic means acting on both ands of said ai'n'iatum a largo and a small diaphragm, a strut having one end attached to the armature near its center and the other end to the large diaphragm, and another strut having ono end attached to the armature air from its center and the oth'cr end to the small diaphragm.

4. In a telephone loud speaker, an armatin-c resiliently supported ncar'its center, a magnctic ticld acting on both ends of said armature a rclalivvlx large and loosely said largo dia hragm, and another strut havpi i in: one 0nd allar-hcd lo said armature at a relatively great distam-c from HR point of SHFPPDSHYII and the other end to Stlltl small diaphragm.

Lure resilivntly supported him its w nter, two pole piwcs adjacnnt each 0nd of mid armature. two coil v i iii-rouiirling said annatuie on the twosidvg of its point of suspension and between said two )olc laces a relatively .laz'ggc and loo cl supported coneshaped paper ilmpl'n'agm, a strut'having one 'end attached to the ape-X of said diaphragm and near its point of suspension, a relatively small tightly strctchczl metallic diaphragm,

and a strut having one end attached near the center of tho metal diaphragm and the other and to said armature outside of said coils and over one of said .polc pieces.

In testimony whereof, I have signed my 5 name to this specification this 12th day of jillgllsf, 1924:. I

' WIL-LEAE I l HENDRY, 

